Abstract: The acid-resistant pipe line steel API X65 (/% : ≤0. 045C, 0. 15 ~0. 35Si, 1. 50 ~ 1. 65Mn, ≤ 0. 008P, ≤0. 001 2S, 0.02 ~ 0.06Alt, 0.45 ~ 0.65Nb, 0.01 ~ 0. 025Ti) is melt by desulphurized metal-100 t top and bottom combined blowing Converter-LF-RH-slab CC flow sheet. The effect of process parameters including drainage sand quality ( graphite content 0. 22% ~0. 86% ) , residence time of molten steel in ladle ( < 180 ~ > 270 min) , LF refining temperature ( < 1620 ~ 1690 ℃)，tap hole perpendicularity and ladle upper nozzle service life (2 ~ 28 times) on ladle free-opening rate has been analyzed. Results show that with lower graphite content in drainage sand, longer residence time of molten steel in ladle, higher LF refining temperature, tap nozzle and stream shifting, less service times of ladle upper nozzle, the ladle free-opening rate is lower. By stabilizing relative technology factors, controlling the process parameters including graphite content in drainage sand ^0. 8% , residence time of molten steel in ladle 180 ~ 240 min and LF end liquid temperature ≤1 640 °C, the free-opening rate of ladle with acid resistant steel increases from 84. 52% to 97. 47% .

摘要： 抗酸管线钢API X65（/%:≤0.045C,0.15~0.35Si,1.50~1.65Mn,≤0.008P,≤0.001 2S,0.02~0.06Alt,0.45~0.65Nb,0.01~0.025Ti）由脱硫铁水-100 t顶底复吹转炉-LF-RH-板坯CC流程冶炼。分析了引流砂质量（石墨含量0.22%~0.86%）,钢包钢水停留时间（<180~>270 min）,LF精炼温度（<1620~1690℃）出钢口垂直度,钢包上水口寿命（2~28次）对自开率影响。结果表明,引流砂中石墨含量低,钢包钢水停留时间长,LF精炼温度高,出钢口和钢流偏移,钢包上水口使用次数少,则钢包自开率低。通过稳定相关工艺因素,控制引流砂中石墨含量≥0.8%,LF钢水停留时间180~240 min,LF终点温度≤1 640℃等工艺参数,使抗酸钢的钢包自开率由84.52%提高到97.47%。

关键词: 抗酸管线钢APIX65, 引流砂, 100t钢包自开率, LF精炼